养浩然之气,做博学之人
kubernetes work 节点运行如下组件:
#docker
#kubelet
#kube-proxy
安装和配置 flanneld#参考 部署flannel网络
#CentOS: source /opt/k8s/bin/environment.sh for node_ip in ${NODE_IPS[@]} do echo ">>> ${node_ip}" ssh root@${node_ip} "yum install -y epel-release" ssh root@${node_ip} "yum install -y conntrack ipvsadm ipset jq iptables curl sysstat libseccomp && /usr/sbin/modprobe ip_vs " done
到 https://download.docker.com/linux/static/stable/x86_64/ 页面下载最新发布包:
wget https://download.docker.com/linux/static/stable/x86_64/docker-18.03.1-ce.tgz tar -xvf docker-18.03.1-ce.tgz
分发二进制文件到所有 worker 节点:
source /opt/k8s/bin/environment.sh for node_ip in ${NODE_IPS[@]} do echo ">>> ${node_ip}" scp docker/docker* k8s@${node_ip}:/opt/k8s/bin/ ssh k8s@${node_ip} "chmod +x /opt/k8s/bin/*" done
cat > docker.service <<"EOF" [Unit] Description=Docker Application Container Engine Documentation=http://docs.docker.io [Service] Environment="PATH=/opt/k8s/bin:/bin:/sbin:/usr/bin:/usr/sbin" EnvironmentFile=-/run/flannel/docker ExecStart=/opt/k8s/bin/dockerd --log-level=error $DOCKER_NETWORK_OPTIONS ExecReload=/bin/kill -s HUP $MAINPID Restart=on-failure RestartSec=5 LimitNOFILE=infinity LimitNPROC=infinity LimitCORE=infinity Delegate=yes KillMode=process [Install] WantedBy=multi-user.target EOF
#EOF 前后有双引号,这样 bash 不会替换文档中的变量,如 $DOCKER_NETWORK_OPTIONS;
#dockerd 运行时会调用其它 docker 命令,如 docker-proxy,所以需要将 docker 命令所在的目录加到 PATH 环境变量中;
#flanneld 启动时将网络配置写入 /run/flannel/docker 文件中,dockerd 启动前读取该文件中的环境变量 DOCKER_NETWORK_OPTIONS ,然后设置 docker0 网桥网段;
#如果指定了多个 EnvironmentFile 选项,则必须将 /run/flannel/docker 放在最后(确保 docker0 使用 flanneld 生成的 bip 参数);
#docker 需要以 root 用于运行;
#docker 从 1.13 版本开始,可能将 iptables FORWARD chain的默认策略设置为DROP,从而导致 ping 其它 Node 上的 Pod IP 失败,遇到这种情况时,需要手动设置策略为 ACCEPT:
#$ sudo iptables -P FORWARD ACCEPT
#并且把以下命令写入 /etc/rc.local 文件中,防止节点重启iptables FORWARD chain的默认策略又还原为DROP
#/sbin/iptables -P FORWARD ACCEPT
分发 systemd unit 文件到所有 worker 机器:
source /opt/k8s/bin/environment.sh for node_ip in ${NODE_IPS[@]} do echo ">>> ${node_ip}" scp docker.service root@${node_ip}:/etc/systemd/system/ done
使用国内的仓库镜像服务器以加快 pull image 的速度,同时增加下载的并发数 (需要重启 dockerd 生效):
cat > docker-daemon.json <<EOF { "registry-mirrors": [ "https://hub-mirror.c.163.com", "https://docker.mirrors.ustc.edu.cn" ], "max-concurrent-downloads": 20 } EOF
分发 docker 配置文件到所有 work 节点:
source /opt/k8s/bin/environment.sh for node_ip in ${NODE_IPS[@]} do echo ">>> ${node_ip}" ssh root@${node_ip} "systemctl stop firewalld && systemctl disable firewalld" ssh root@${node_ip} "/usr/sbin/iptables -F && /usr/sbin/iptables -X && /usr/sbin/iptables -F -t nat && /usr/sbin/iptables -X -t nat" ssh root@${node_ip} "/usr/sbin/iptables -P FORWARD ACCEPT" ssh root@${node_ip} "systemctl daemon-reload && systemctl enable docker && systemctl restart docker" ssh root@${node_ip} 'for intf in /sys/devices/virtual/net/docker0/brif/*; do echo 1 > $intf/hairpin_mode; done' ssh root@${node_ip} "sudo sysctl -p /etc/sysctl.d/kubernetes.conf" done
#关闭 firewalld(centos7)/ufw(ubuntu16.04),否则可能会重复创建 iptables 规则;
#清理旧的 iptables rules 和 chains 规则;
#开启 docker0 网桥下虚拟网卡的 hairpin 模式;
source /opt/k8s/bin/environment.sh for node_ip in ${NODE_IPS[@]} do echo ">>> ${node_ip}" ssh k8s@${node_ip} "systemctl status docker|grep Active" done
确保状态为 active (running),否则查看日志,确认原因: journalctl -u docker
source /opt/k8s/bin/environment.sh for node_ip in ${NODE_IPS[@]} do echo ">>> ${node_ip}" ssh k8s@${node_ip} "/usr/sbin/ip addr show flannel.1 && /usr/sbin/ip addr show docker0" done
确认各 work 节点的 docker0 网桥和 flannel.1 接口的 IP 处于同一个网段中(如下 192.30.32.0 和 192.30.32.1):
5: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN
link/ether 86:9d:a7:0d:4c:36 brd ff:ff:ff:ff:ff:ff
inet 192.30.32.0/32 scope global flannel.1
valid_lft forever preferred_lft forever
6: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
link/ether 02:42:a9:4e:83:e1 brd ff:ff:ff:ff:ff:ff
inet 192.30.32.1/24 brd 192.30.32.255 scope global docker0
valid_lft forever preferred_lft forever
参考:
https://www.kubernetes.org.cn/3063.html
https://www.kubernetes.org.cn/3096.html
https://github.com/opsnull/follow-me-install-kubernetes-cluster
http://www.imooc.com/article/23355
https://www.docker.com/
编辑:孙小北
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